Explanation of Names
Named for the bright emerald metalic green eyes.
50 spp. in 7 genera in our area(1)
, ca. 400 spp. in almost 50 genera of 6 subfamilies worldwide(2)(3)
medium to large sized dragonflies, 35 to 68 mm long.
Usually have bright emerald metallic green eyes and sometimes thorax (although some species are duller).
Eyes touch for a fair section.
Best diagnosed to family by the wing patterns: dissimilar wing triangles and anal loop (in the hind wing) that is foot shaped but without a distinct toe. (4)
Individual species can be identified by the males tail appendages
or the females genitalia plates
. A good field guide will have drawings of these features to assist with identification of each species.
Prefer to hang rather than perch. Often perch on vegetation or stems on an 45 deg angle.